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65 lines
2.3 KiB
65 lines
2.3 KiB
# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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# file Copyright.txt or https://cmake.org/licensing for details.
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#[=======================================================================[.rst:
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CMakeDependentOption
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--------------------
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Macro to provide an option dependent on other options.
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This macro presents an option to the user only if a set of other
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conditions are true.
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Usage:
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.. code-block:: cmake
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cmake_dependent_option(<option> "<help_text>" <value> <depends> <force>)
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Where ``<option>`` is available to the user if ``<depends>`` is true. When
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``<option>`` is available, the given ``<help_text>`` and initial ``<value>``
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are used. If the ``<depends>`` condition is not true, ``<option>`` will not be
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presented and will always have the value given by ``<force>``. Any value set by
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the user is preserved for when the option is presented again. Each element in
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the fourth parameter is evaluated as an if-condition, so
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:ref:`Condition Syntax` can be used.
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Example invocation:
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.. code-block:: cmake
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cmake_dependent_option(USE_FOO "Use Foo" ON
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"USE_BAR;NOT USE_ZOT" OFF)
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If ``USE_BAR`` is true and ``USE_ZOT`` is false, this provides an option called
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``USE_FOO`` that defaults to ON. Otherwise, it sets ``USE_FOO`` to OFF and
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hides the option from the user. If the status of ``USE_BAR`` or ``USE_ZOT``
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ever changes, any value for the ``USE_FOO`` option is saved so that when the
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option is re-enabled it retains its old value.
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#]=======================================================================]
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macro(CMAKE_DEPENDENT_OPTION option doc default depends force)
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if(${option}_ISSET MATCHES "^${option}_ISSET$")
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set(${option}_AVAILABLE 1)
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foreach(d ${depends})
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string(REGEX REPLACE " +" ";" CMAKE_DEPENDENT_OPTION_DEP "${d}")
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if(${CMAKE_DEPENDENT_OPTION_DEP})
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else()
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set(${option}_AVAILABLE 0)
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endif()
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endforeach()
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if(${option}_AVAILABLE)
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option(${option} "${doc}" "${default}")
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set(${option} "${${option}}" CACHE BOOL "${doc}" FORCE)
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else()
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if(${option} MATCHES "^${option}$")
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else()
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set(${option} "${${option}}" CACHE INTERNAL "${doc}")
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endif()
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set(${option} ${force})
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endif()
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else()
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set(${option} "${${option}_ISSET}")
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endif()
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endmacro()
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